-static struct dma_async_tx_descriptor *
-mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
- size_t len, unsigned long flags)
-{
- struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan);
- struct mv_xor_desc_slot *sw_desc, *grp_start;
- int slot_cnt;
-
- dev_dbg(mv_chan_to_devp(mv_chan),
- "%s dest: %pad src %pad len: %u flags: %ld\n",
- __func__, &dest, &src, len, flags);
- if (unlikely(len < MV_XOR_MIN_BYTE_COUNT))
- return NULL;
-
- BUG_ON(len > MV_XOR_MAX_BYTE_COUNT);
-
- spin_lock_bh(&mv_chan->lock);
- slot_cnt = mv_chan_memcpy_slot_count(len);
- sw_desc = mv_xor_alloc_slots(mv_chan, slot_cnt, 1);
- if (sw_desc) {
- sw_desc->type = DMA_MEMCPY;
- sw_desc->async_tx.flags = flags;
- grp_start = sw_desc->group_head;
- mv_desc_init(grp_start, flags);
- mv_desc_set_byte_count(grp_start, len);
- mv_desc_set_dest_addr(sw_desc->group_head, dest);
- mv_desc_set_src_addr(grp_start, 0, src);
- sw_desc->unmap_src_cnt = 1;
- sw_desc->unmap_len = len;
- }
- spin_unlock_bh(&mv_chan->lock);
-
- dev_dbg(mv_chan_to_devp(mv_chan),
- "%s sw_desc %p async_tx %p\n",
- __func__, sw_desc, sw_desc ? &sw_desc->async_tx : NULL);
-
- return sw_desc ? &sw_desc->async_tx : NULL;
-}
-